I have removed the JS you mentioned but this hasn’t made any difference unfortunately. The fonts file I created but do not use the font-face functionality so this shouldn’t cause conflict but I have moved it into the correct file location as it was within the css file not the fonts file which is what the code stipulates.

I see enough of what you describe in Windows Safari browser, for me the text on the whole page smoothly transforms to opacity .5 lime green and then transforms back to its original colors (strangely text of every color is doing it. However if you look here http://www.kriesi.at/themes/angular/slideshow-frontpage-example/ , the slider demo, I don’t see any problems.

So the only thing that can be causing this is something added to the original theme. The best way to go about this, is to deactivate every single plugin, (if you dont want to do this on the live site, you can setup a development dev.your-domain.com, which is always a good idea).

As you go through the plugins (jetpack and some kind of a link tracker, nextgen, some youtube video player *this one feels to me as a prime candidate* , then you got some sinister jquery variable hanging all alone which made me check your site for malware, you have none. however you are running an old version of Plesk control panel that must be updated ( http://sitecheck.sucuri.net/results/www.liebekuchen.co.uk/ ) .. but that’s a warning.

So please , we need to go one by one with the plugins till we find the culprit then see if we can substitute it and get you back on track.